Look at the code below :-

#!/usr/bin/env ruby

class Foo
  def baz
    11
  end
end


Now my Rspec code :-

require_relative "../test.rb"

describe Foo do
  before { Foo.any_instance.stub(:baz).and_return(20) }

  it "defines #foo dynamically" do
    expect_any_instance_of(Foo).to receive(:baz).and_return(20)
    subject.baz
  end
end

And finally I got :-

Deprecation Warnings:

Using `any_instance` from rspec-mocks' old `:should` syntax without explicitly 
enabling the syntax is deprecated. Use the new `:expect` syntax or explicitly 
enable `:should` instead. Called from /home/arup/Ruby/spec/test_spec.rb:4:in 
`block (2 levels) in <top (required)>'.


If you need more of the backtrace for any of these deprecations to
identify where to make the necessary changes, you can configure
`config.raise_errors_for_deprecations!`, and it will turn the
deprecation warnings into errors, giving you the full backtrace.

1 deprecation warning total

Finished in 0.04004 seconds (files took 0.47731 seconds to load)
1 example, 0 failures
arup@linux-wzza:~/Ruby>



What else way I can write this ?

-- 
================
Regards,
Arup Rakshit
================
Debugging is twice as hard as writing the code in the first place. Therefore, 
if you write the code as cleverly as possible, you are, by definition, not 
smart enough to debug it.

--Brian Kernighan

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